28A12

Metric Roller Chain Sprocket

Item #100967145

32.02 mm Minimum Bore

126.57 mm Maximum Bore

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Product Details

Maximum bores shown will accommodate standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at an angle to keyseat.

Manufactured of high carbon steel
Precise machining and processes ensure consistent finish and high quality
Bores are concentric to pitch line, minimizing run out
Chain rows are parallel and precisely spaced to increase longevity of sprocket and chain

Specifications

Pitch Diameter	171.7 mm
Pitch Root Diameter	143.8 mm
Width Across Teeth	29.44 mm
Hardened Teeth	Without Hardened Teeth
Bore Type	Reborable
Sprocket Style	A
Hub Length Thru	N/A
Bore Style	Minimum Bore
Root Diameter	143.8 mm
Length Through Bore	29.44 mm
No. of Teeth	12
Family Name	No. 28 - 44.450 mm Pitch - Single - A
Bore Range [Max]	126.57 mm
Bore Range [Min]	32.02 mm
Martin No.	28A12
Outside Dia.	199.36 mm
Hub Dia.	N/A
Pin Diameter	27.94 mm
Single Strand Tooth Thickness	29.44 mm
Series	A
Chain No.	28B, 28B-1
Material	Steel
Outside Dia. [Min]	199.36 mm
Hub Projection	N/A
Chain Pitch	44.45 mm
Inch/Metric	Metric
Pitch Diameter [Min]	171.7 mm
No. of Strands Across	1
Caliper Diameter	143.8 mm
Weight	8.7 LB
EAN or UPC	697950406558